Yaroslav Bogutsky

VKontakte products is a showcase with goods and services in your VKontakte group. You add products with photos, prices and detailed descriptions on the website, and they are published in the VKontakte catalog, expanding the audience of buyers through users of this social network.

VkCommerce

The plugin publishes photos and descriptions of products from your online store to the storefront in a VKontakte group.

igrp

VK Lock make is possible to restrict page\post access to authorized VKontakte group members only. 
Plugin will take care about site visitor authorization in VKontakte and checking if he\she is member of VKontakte group specified by you. 
Access to the protected page\post content will be allowed only if user is authorized and is a group member.
Restriction works for password protected pages\posts only – this means that your have to set page\post type to “password protected” and specify any password (plugin does not use this password, if you like you can access protected page with that password via conditional password access form, provided by WordPress).
Plugin works via VKontakte API (https://oauth.vk.com/authorize) therefore you need to make some proper (its very easy) settings at VK.COM side. See Installation instructions.
This plugin may not work properly with PHP versions earlier than PHP 5.2

VK Lock

Restrict page\post access to authorized VKontakte group members only.

VkCommerce vs VK Lock